I am trying to figure out how to wire this tractor. It is serial number 108941. The engine was replaced with a new HH100 115255H SER 4049E at some point. The new engine has a standalone regulator-rectifier so the original one on the tractor was bypassed. The ignition switch also was replaced at some point with a generic that did not have a provision for magneto kill and was rigged with a push button kill but never worked. I never looked into it at that time and just used the choke to stop the engine.
I sold the tractor to a friend a few years ago and he recently attempted to replace the ignition switch in an effort to make the engine shut off using the key switch. He ended up putting in the same generic switch, wired it back together incorrectly and melted some wiring in the process. I offered to rewire it for him as a favor. The engine does still run so I am hoping everything still works.
I have the tractor wiring diagram from the original JD service manual and also the Tecumseh service manual for this engine. The problem I have is the ignition switch letter codes are not in the same language between the two manuals and I need to know where to run the leads coming from the engine and the proper switch to use.
There is a GREEN and RED wire coming from the engine. The Tecumseh manual shows the green wire going to ignition terminal "M" and the red going to terminal "R."
The John Deere diagram shows a LT GREEN wire splicing into ORANGE and going to terminal "C," and a WHITE wire going to terminal "D."
The original ignition switch was JD # AM30771 and appears to have been replaced with AM102543.
Pictures to follow for reference.
Edited by RAJ, February 01, 2016 - 02:32 PM.